NOAO >   Observing Info >   Approved Programs >   2013A-0072

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Proposal Information for 2013A-0072


PI: Chun Ly, Space Telescope Science Institute, chunly@stsci.edu
Address: 3700 San Martin Drive, Baltimore, MD 21218-2410, USA

CoI: Matthew Malkan, University of California, Los Angeles
CoI: Tohru Nagao, Kyoto University
CoI: Masao Hayashi, National Astronomical Observatory of Japan
CoI: Nobunari Kashikawa, National Astronomical Observatory of Japan
CoI: Kazuhiro Shimasaku, University of Tokyo, Japan
CoI: Kentaro Motohara, University of Tokyo, Japan

Title: Investigating the Processes Driving Low-Mass Galaxy Evolution with Gas Metallicities of Starburst Galaxies

Abstract: There appears to be a ``fundamental" relationship that links the stellar masses, star-formation rates (SFRs), and gas metallicities of local galaxies. It has been used to constrain the major processes in galaxy evolution. However, it is unclear whether (1) this observed relation holds at earlier cosmic time, and (2) if it applies to low-mass galaxies and/or those with relatively higher specific SFRs (sSFRs). We request follow-up Hectospec spectroscopy %and DEIMOS spectroscopy to obtain gas metallicity measurements in key unexplored domains of galaxy parameter space. We will target \Ntarget low-mass high equivalent width (EW) emission-line galaxies at \zrange in the Subaru Deep Field (SDF). This sample is a factor of almost 4 larger than the existing data for galaxies with similar redshifts, SFRs and stellar masses. The SDF is ideal for such a survey because of its unique multi-wavelength imaging data that allow us to (1) identify a much higher surface density of high-EW star-forming galaxies over a wide redshift range than in any other survey, and (2) determine stellar masses and SFRs for individual galaxies. With the largest spectroscopic sample of low mass and/or high sSFR galaxies, we will determine the relationships between metallicity, stellar mass, and SFRs for dwarf galaxies. We will examine if the same galaxy evolution processes in massive galaxies also hold for lower mass galaxies over the past six billion years.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2013A-0072

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